Global Patent Index - EP 1521856 A1

EP 1521856 A1 20050413 - MARTENSITIC STAINLESS STEEL SEAMLESS PIPE AND A MANUFACTURING METHOD THEREOF

Title (en)

MARTENSITIC STAINLESS STEEL SEAMLESS PIPE AND A MANUFACTURING METHOD THEREOF

Title (de)

NAHTLOSES ROHR AUS MARTENSITISCHEM ROSTFREISTAHL UND VERFAHREN ZUM HERSTELLEN

Title (fr)

TUYAU SANS SOUDURE EN ACIER INOXYDABLE MARTENSITIQUE ET PROCEDE DE FABRICATION CORRESPONDANT

Publication

EP 1521856 A1 20050413 (EN)

Application

EP 03741248 A 20030707

Priority

  • JP 0308625 W 20030707
  • JP 2002206169 A 20020715

Abstract (en)

[origin: WO2004007780A1] The present invention provides a martensitic stainless steel seamless pipe, having no inner surface defect and suppressing a delayed fracture generation in the impact-worked portions, and a method for manufacturing such a seamless steel pipe. A martensitic stainless steel seamless pipe, characterized by consisting of C: 0.15 to 0.22%, Si: 0.1 to 1.0%, Mn: 0.10 to 1.00%, Cr: 12.00 to 14.00%, P: 0.020% or less, S: 0.010% or less, N: 0.05% or less, O(Oxygen): 0.0060% or less, at least one alloying element selected from V, Nb and Ti of 0.005 to 0.200 % and B of 0.0005 to 0.0100 %, and the balance Fe and impurities, satisfying either the following inequalities (1), (2), (4) and (5) or the following inequalities (1), (3), (4) and (5): C* + 10N* <= 0.45, (1) H1 <= -0.003(C* + 10N*) + 0.0016, (2) H2 <= -0.0018(C* + 10N*) + 0.00096, (3) Cr* <= 9.0, (4) S <= 0.088N* + 0.00056, (5).

IPC 1-7

C21D 9/08; C22C 38/18; C22C 38/24; C22C 38/26; C22C 38/28; C22C 38/32

IPC 8 full level

B21B 19/04 (2006.01); C22C 38/00 (2006.01); C21D 8/10 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/42 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01)

CPC (source: EP)

C21D 8/105 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/42 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01)

Citation (search report)

See references of WO 2004007780A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

DOCDB simple family (publication)

WO 2004007780 A1 20040122; AR 040354 A1 20050330; AU 2003280989 A1 20040202; BR 0312612 A 20050419; CA 2491834 A1 20040122; CA 2491834 C 20100622; CN 100355914 C 20071219; CN 100532617 C 20090826; CN 101070579 A 20071114; CN 1668768 A 20050914; EP 1521856 A1 20050413; EP 1521856 B1 20130821; JP 2004043935 A 20040212; JP 4126979 B2 20080730; MX PA05000454 A 20050323; ZA 200500365 B 20050928

DOCDB simple family (application)

JP 0308625 W 20030707; AR P030102375 A 20030630; AU 2003280989 A 20030707; BR 0312612 A 20030707; CA 2491834 A 20030707; CN 03816735 A 20030707; CN 200710109933 A 20030707; EP 03741248 A 20030707; JP 2002206169 A 20020715; MX PA05000454 A 20030707; ZA 200500365 A 20050114